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An acute angle is an angle of less than 90°. A 90° angle is a right angle, the angle you find at two adjoining edges of a square. An angle smaller than a right angle is called an acute angle, while an angle larger than it is called and obtuse angle.
A square is a rhombus with right angles so you would need to know one of the angles or an exterior angle or another angle that shares a vertex with the shape.
A squared+ B squared=C squared. find the square root of the answer and you get the longest side.
The general formula for a triangle is Base x Height / 2. That applies quite easily for a right angle triangle.
right angle!